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Summary of Activity for Restricted Stock Awards (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Number of Shares  
Unvested at beginning of year | shares 5,802,409
Granted | shares 2,352,641
Vested | shares (1,660,633)
Cancelled | shares (132,300)
Unvested at end of period | shares 6,362,117
Weighted Average Grant Date Fair Value  
Unvested at beginning of year | $ / shares $ 15.24
Granted | $ / shares 15.83
Vested | $ / shares 15.29
Cancelled | $ / shares 15.28
Unvested at end of period | $ / shares $ 15.44